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Nitoseal 878constructive solutionsCI/SfB:March 2009High performance, elastomeric, pavementjoint sealantUsesFor the sealing and maintenance of joints in concreteroads, concrete runways and hard standings. Nitoseal878 is particularly suitable for sealing areas where fueland oil spillage might occur such as aircraft fuellingareas, oil terminals, garage forecourts, parking andcargo areas.AdvantagesFuel, oil and hydraulic fluid resistanceHigh durability and long service lifeHigh movement accommodationStandardsBritish Standard 5212:1990 - types N, F and FB.DescriptionNitoseal 878 is a two component product designed toretain its movement accommodation of 25% on buttjoints throughout temperature extremes. It does notharden in cold weather nor become excessively soft orpick up in hot conditions.In trafficked areas the maximum expansion joint widthshould be limited to 30mm. It is necessary to recess thelevel of the sealant 5-8 mm below the pavement surfacedependent on the time of year and temperature prevailingat the time of sealing.The width/depth ratio of the Nitoseal 878 seal should be1:1 to 1½:1 subject to a minimum 10mm depth of sealant(example, contraction joint: 15mm wide x 13mm depth;expansion joint: 25mm wide x 20mm depth).PropertiesForm:Colour:Two component productcomprising liquid base and curativeGreyMAF (BS 6093): Butt joints 25%Cure process:ApplicationChemical curetemperatures: 5°C - 35°CSetting Time: After 6 hours @ 25 o C Nitoseal 878will be tack free and accepttraffic. Full cure and maximumhardness will be achieved in 3-4days at 25 o CShore A Hardness: 20Chemical Aviation fuels Synthetic oilsresistance to Hydraulic fluids Mineral oilsoccasional Skydrol White spiritspillage: Kerosene Mild alkalisSolids content: 100%PetrolDiesel fuelsFlash point: Over 65°CFlammability:Application instructionsJoint preparationDilute acidsDe-icing saltsUreaBurns but does not readily supportcombustionJoint sealing slots in concrete should be accuratelyformed and must be dry, sound, clean and free from frost.Remove all dust and laitance by grit blasting or grinding.Avoid polishing the joint sides when grinding. Theprepared sealing slot should be blown out with dry, oilfreecompressed air.Ensure that any expansion joint filler is tightly packed inthe joint and insert a bond breaker or Expandafoam cordcaulked tightly into the base of the sealing groove toprevent sealant adhering to the base of the slot andprovide the specified depth of sealant.PrimingConcrete joint faces should be primed with FosrocPrimer 20.Decant sufficient primer into a clean dry tin for the day’susage. Do not return unused primer to the supply tin.Prime the joint faces with a thin uniform coat of primerand allow solvent to evaporate before sealing. This takesbetween 30 minutes and 2 hours depending on climaticconditions. If sealant is not applied within 2 hours thejoint face should be reprimed.Where concrete joints are exposed, or subject toconditions of prevailing damp, or where the concrete isunusually dense or porous, the use of Primer 19 isrecommended. Contact the local Fosroc office for furtherdetails.Empty the entire contents of the Primer 19 hardener tininto the base tin, and replace base tin lid. Mix thoroughlyby shaking tin for 2 minutes. Prime the joint face using aclean dry brush. Avoid over application of primer causingpuddles in the bottom of the joint. Nitoseal 878 should beapplied between 30 minutes and 4 hours after priming. Ifsealant is not applied within 4 hours the joint face shouldbe reprimed.The mixed Fosroc Primer 19 should be applied within oneworking day. Do not split packs of Fosroc Primer 19.Page 1

CI/SfB:March 2009Nitoseal 878MixingDrain totally the contents of the curing agent tin into thelarge base component tin. Using a hand held, slow speeddrill (300 to 500 rpm) fitted with a Fosroc paddle bladestirrer mix for 1 minute. Stop and scrape around the top ofthe tin to remove any remaining curing agent. Continue tomix for 3 minutes until the material is thoroughly mixed.In cold weather, Nitoseal 878 mixes more easily if storedovernight at room temperature.ApplicationPour mixed sealant into a Fosroc G Gun after removingthe nozzle end cap, pulling back the plunger rod andreplacing end nozzle. In joints of 25 mm and above, themixed sealant may be poured directly from the tin bybending the side to form a pouring lip. Apply mixedsealant so that the finished level of the seal is recessedbelow the trafficked surface as specified.CleaningClean equipment immediately after use with FosrocEquipment Cleaner. Remove mixed material from handswith ‘Swarfega’ or similar industrial hand cleanser.EstimatingPackagingNitoseal 878 is supplied in cartons containing 2 x 5 litreunits, comprising a tin of base and a tin of curing agent.1 litre of Fosroc Primer 19 or 20 will be sufficient for 20litres of Nitoseal 878. Yields are theoretical, noallowance has been made for variations in jointdimensions or wastage.LimitationsApply at temperatures of 5°C and rising. Do not warmmaterial above 35°C.Do not apply direct heat to product.Nitoseal 878 is not compatible with bituminous surfaces.Where Nitoseal 878 could come into contact withpavement asphalt, please contact the local FosrocTechnical Department.For the sealing of industrial floor joints, higher modulussealants such as Nitoseal MS300* or Expoflex 800* arerecommended. *See seperate data sheetStorageNitoseal 878: 12 months in original containers stored incool, dry conditions i.e. not exceeding 25°C. Highertemperatures may reduce storage life.PrecautionsHealth and safetyFor further information refer to appropriate Product SafetyData Sheet.Guide to Nitoseal 878 quantitiesJoint size Litre per Metre perin mm metre 20.0 litrepack10 x 10 0.100 20013 x 13 0.169 11815 x 15 0.225 8920 x 15 0.300 6720 x 20 0.400 5025 x 20 0.500 4025 x 25 0.625 3230 x 25 0.750 26Important noteFosroc products are guaranteed against defective materials and manufacture and are sold subject to its standard Conditions for the Supply ofGoods and Services, copies of which may be obtained on request. Whilst Fosroc endeavours to ensure that any advice, recommendation,specification of information it may give is accurate and correct, it cannot, because it has no direct or continuous control over where or how itsproducts are applied, accept any liability either directly or indirectly arising from the use of its products, whether or not in accordance with anyadvice, specification, recommendation of information given by it.Fosroc LimitedDrayton Manor Business ParkColeshill Road, Tamworth,Staffordshire B78 3TL. UKtelephone: fax: email:+44 0 (1827) 262222 +44 0 (1827) 262444 uk@fosroc.comwww.fosroc.comCertificate number FM 610Page 2